percent key

例句：

1. 1.The company's profit margin is 20% of its revenue.
   该公司的利润边际是其收入的20%。
2. 2.The cost of living in this city is 5% higher than the national average.
   这个城市的生活成本比全国平均水平高出5%。
3. 3.The sales figures for the quarter are up by 10% compared to last year.
   与去年相比，这个季度的销售数字增长了10%。